I hate to be that guy, but I'm 52 now and I've been hearing about how Quantum Computing is going to revolutionise everything in the next two years, since I was in primary school and ZX81s were state-of-the-art.
At least a couple of manufacturers offered a practical and afforable(-ish) transputer-based system in the 80s that you could have actually gone out and bought.
The thing is we have nearly no idea when an invention is going to occur. We are horrifically bad at predicting it.
They were going to revolutionise absolutely everything to do with computing in just a couple of years, some 40 years ago.
I've been hearing the same thing about quantum computing for about as long.
I will take "Post Quantum Cryptography" seriously when I can buy a quantum microprocessor off the shelf.
Bullshit, unless you were listening to raving crackpots, and probably not even if you were.
The people worried about this now are not raving crackpots.